In message HIENLGPNLABMIKBCNLNOKEBPCAAA.powerdriver@sina.com you wrote:

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I am going to design a GUI for ppcboot to make it have a prety face to user,

but, how can I do this work? how much effort?

I'm not sure what you mean. The subject indicates you want to make it look like one of those PC BIOSes. If this is your intention, you will have to:

* drop support of all boards that don't have a graphic display connected (which is probably > 90% of all boards)

* remove support for the serial console interface; this makes porting U-Boot to new hardware a makjor pain in the ...

* drop the shell interface, drop variable support, etc.

* drop support for most of the other features that make U-Boot as powerful as it is today

What do you want to acchieve? Which part of U-Boot usage do you think can be improved by providing a BIOS-like interface?

Who are your users that you think they will benefit from such a change? And how are they using U-Boot?

Sorry, but I don't understand which problem you are trying to address.

Wolfgang Denk